QB Issue Resolution:

Use the QuickBooks Layout Designer to create customized invoices, sales receipts, estimates, credit memos, statements, and purchase orders that help present a more professional and polished look for your business.
Detailed instructions

Choose Lists > Templates.
Select the form you would like to customize.
Click Templates > Edit Template.
Choose Templates > New if you want to design a form from scratch.
Click Layout Designer.
Customize the template as needed. Use the Layout Designer Help feature for further assistance in using the Layout Designer.
Click OK.
Click Additional Customization.
Select, or click to clear fields as needed.
Click OK.
Click Manage Templates.
Enter a unique name for the new template in the Template Name field (for example, My Company Invoice).
Click OK.
Click OK.

Other articles to try

Customize your forms (Credit Memo, Estimate, Invoice, Purchase Order, Sales Order, Sales Receipt, Statement)

Resolution for Issue 'Customize templates.' available: Yes (Solved).
Source: Intuit Community forum.

Customize templates.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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